feat: Define protocol fee in autopilot configuration

[sunce86]

Problem

Autopilot should have a set of configuration parameters to define the protocol fee. There are two ways we are considering to take the fee:

1. A cut from the surplus above best quote
2. Fixed fee

This task captures the work needed to implement (1).

It should be possible to define parameters

1. How much percent of surplus above best quote should be taken as a protocol fee
2. Cap in percent of volume
3. Cap in absolute value ($).

The default values should be:

1. 50%
2. 6%
3. 1000$

Acceptance criteria

• Autopilot can be configured with different fee parameters.

[sunce86]

Closed with #2098